1 files changed, 76 insertions, 0 deletions
diff --git a/roms/skiboot/external/common/rules.mk b/roms/skiboot/external/common/rules.mk
new file mode 100644
index 000000000..7190813b8
--- /dev/null
+++ b/roms/skiboot/external/common/rules.mk
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: Apache-2.0
+
+CC ?= $(CROSS_COMPILE)gcc
+LD ?= $(CROSS_COMPILE)ld
+ARCH := $(shell $(GET_ARCH) "$(CROSS_COMPILE)")
+
+ifeq ($(ARCH),ARCH_ARM)
+arch := arm
+ARCH_FILES := arch_flash_common.c arch_flash_arm.c ast-sf-ctrl.c
+else
+ifeq ($(ARCH),ARCH_POWERPC)
+arch := powerpc
+ARCH_FILES := arch_flash_common.c arch_flash_powerpc.c
+else
+arch := unknown
+ARCH_FILES := arch_flash_common.c arch_flash_unknown.c
+endif
+endif
+
+# Use make V=1 for a verbose build.
+ifndef V
+        Q_CC=	@echo '    CC ' $@;
+        Q_LINK=	@echo '  LINK ' $@;
+        Q_LN=   @echo '    LN ' $@;
+        Q_MKDIR=@echo ' MKDIR ' $@;
+endif
+
+
+.PHONY: links
+links: libflash ccan common
+
+libflash:
+	$(Q_LN)ln -sf ../../libflash ./libflash
+
+ccan:
+	$(Q_LN)ln -sf ../../ccan ./ccan
+
+common:
+	$(Q_LN)ln -sf ../common ./common
+
+make_version.sh:
+	$(Q_LN)ln -sf ../../make_version.sh
+
+ARCH_SRC := $(addprefix common/,$(ARCH_FILES))
+ARCH_OBJS := $(addprefix common-,$(ARCH_FILES:.c=.o))
+
+# Arch links are like this so we can have dependencies work (so that we don't
+# run the rule when the links exist), pretty build output (knowing the target
+# name) and a list of the files so we can clean them up.
+ARCH_LINKS ?= common/ast-sf-ctrl.c common/ast.h common/io.h common/lpc.h
+
+arch_links: $(ARCH_LINKS)
+common/ast.h : ../../include/ast.h | common
+	$(Q_LN)ln -sf ../../include/ast.h common/ast.h
+
+common/io.h : ../common/arch_flash_$(arch)_io.h | common
+	$(Q_LN)ln -sf arch_flash_$(arch)_io.h common/io.h
+
+common/ast-sf-ctrl.c : ../../hw/ast-bmc/ast-sf-ctrl.c | common
+	$(Q_LN)ln -sf ../../hw/ast-bmc/ast-sf-ctrl.c common/ast-sf-ctrl.c
+
+common/lpc.h: ../../include/lpc.h | common
+	$(Q_LN)ln -sf ../../include/lpc.h common/lpc.h
+
+.PHONY: arch_clean
+arch_clean:
+	rm -rf $(ARCH_OBJS) $(ARCH_LINKS)
+
+$(ARCH_SRC): | common
+
+$(ARCH_OBJS): common-%.o: common/%.c $(ARCH_LINKS)
+	$(Q_CC)$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
+
+common-arch_flash.o: $(ARCH_OBJS)
+	$(Q_LD)$(LD) -r $(ARCH_OBJS) -o $@
+